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- Committer: Teddy Hogeborn
- Date: 2008-08-01 06:33:15 UTC
- Revision ID: teddy@fukt.bsnet.se-20080801063315-4k33q3ek28hjc3tu
* plugins.d/plugbasedclient.c: Update include file comments.
(struct process.disable): Renamed to "disabled". All users changed.
(addarguments): Renamed to "addargument". All callers changed.
(doc, args_doc): Removed.
(main): Changed default "plugindir" to
"/conf/conf.d/mandos/plugins.d". Renamed "rfds_orig" to
"rfds_all"; all users changed. New "debug" and
"exitstatus" variables. New "--debug" option. Removed
unnecessary ".flags = 0" from all options. Changed so that
"--disable-plugin" only takes one plugin. Check for
non-existence of ":" in argument to "--options-for". Added
some debugging outputs. Set the FD_CLOEXEC flag on the
directory FD. More capable code for dealing with
disallowed plugin file name prefixes and suffixes. Bug
fix: check for some malloc failures. Moved allocating the
"struct process *new_process" to after the fork. Do
_exit() instead of exit() in the child.
* plugins.d/mandosclient.c: Updated contact information.
(struct process.disable): Renamed to "disabled". All users changed.
(addarguments): Renamed to "addargument". All callers changed.
(doc, args_doc): Removed.
(main): Changed default "plugindir" to
"/conf/conf.d/mandos/plugins.d". Renamed "rfds_orig" to
"rfds_all"; all users changed. New "debug" and
"exitstatus" variables. New "--debug" option. Removed
unnecessary ".flags = 0" from all options. Changed so that
"--disable-plugin" only takes one plugin. Check for
non-existence of ":" in argument to "--options-for". Added
some debugging outputs. Set the FD_CLOEXEC flag on the
directory FD. More capable code for dealing with
disallowed plugin file name prefixes and suffixes. Bug
fix: check for some malloc failures. Moved allocating the
"struct process *new_process" to after the fork. Do
_exit() instead of exit() in the child.
* plugins.d/mandosclient.c: Updated contact information.
- files added:
- ca.pem
- files removed:
- initramfs-tools-hook
- files renamed:
- plugin-runner.c => plugbasedclient.c
- plugins.d/password-request.c => plugins.d/mandosclient.c
- plugins.d/password-prompt.c => plugins.d/passprompt.c
- mandos.conf => server.conf
- mandos => server.py
- files modified:
- Makefile
added
removed
plugbasedclient.c
21
21
* Contact the authors at <mandos@fukt.bsnet.se>.
22
22
*/
23
23
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
25
26
#include <stddef.h> /* size_t, NULL */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
29
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
stat, waitpid(), WIFEXITED(),
34
WEXITSTATUS(), wait(), pid_t,
35
uid_t, gid_t, getuid(), getgid(),
36
dirfd() */
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
FD_SET(), FD_ISSET(), FD_CLR */
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS() */
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
24
#include <stdio.h> /* popen(), fileno(), fprintf(),
25
stderr, STDOUT_FILENO */
42
26
#include <iso646.h> /* and, or, not */
27
#include <sys/types.h> /* DIR, opendir(), stat(), struct stat,
28
waitpid(), WIFEXITED(),
29
WEXITSTATUS(), wait() */
30
#include <sys/wait.h> /* wait() */
43
31
#include <dirent.h> /* DIR, struct dirent, opendir(),
44
readdir(), closedir(), dirfd() */
32
readdir(), closedir() */
33
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
45
34
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
46
fcntl(), setuid(), setgid(),
47
F_GETFD, F_SETFD, FD_CLOEXEC,
48
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
50
execv(), write(), read(),
51
close() */
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), strcpy(),
55
strcat() */
35
fcntl() */
36
#include <fcntl.h> /* fcntl() */
37
#include <stddef.h> /* NULL */
38
#include <stdlib.h> /* EXIT_FAILURE */
39
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
40
FD_SET(), FD_ISSET() */
41
#include <string.h> /* strlen(), strcpy(), strcat() */
42
#include <stdbool.h> /* true */
43
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
44
WEXITSTATUS() */
56
45
#include <errno.h> /* errno */
57
#include <argp.h> /* struct argp_option, struct
58
argp_state, struct argp,
59
argp_parse(), ARGP_ERR_UNKNOWN,
60
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
61
#include <signal.h> /* struct sigaction, sigemptyset(),
62
sigaddset(), sigaction(),
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
SIG_UNBLOCK, kill() */
65
#include <errno.h> /* errno, EBADF */
66
67
#define BUFFER_SIZE 256
68
69
const char *argp_program_version = "plugin-runner 1.0";
70
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
46
#include <argp.h> /* struct argp_option,
47
struct argp_state, struct argp,
48
argp_parse() */
71
49
72
50
struct process;
73
51
77
55
char *buffer;
78
56
size_t buffer_size;
79
57
size_t buffer_length;
80
bool eof;
81
bool completed;
82
int status;
83
58
struct process *next;
84
59
} process;
85
60
91
66
struct plugin *next;
92
67
} plugin;
93
68
94
static plugin *getplugin(char *name, plugin **plugin_list){
69
plugin *getplugin(char *name, plugin **plugin_list){
95
70
for (plugin *p = *plugin_list; p != NULL; p = p->next){
96
71
if ((p->name == name)
97
72
or (p->name and name and (strcmp(p->name, name) == 0))){
120
95
return new_plugin;
121
96
}
122
97
123
static void addargument(plugin *p, char *arg){
98
void addargument(plugin *p, char *arg){
124
99
p->argv[p->argc] = arg;
125
100
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
126
101
if (p->argv == NULL){
131
106
p->argv[p->argc] = NULL;
132
107
}
133
108
134
/*
135
* Based on the example in the GNU LibC manual chapter 13.13 "File
136
* Descriptor Flags".
137
* *Note File Descriptor Flags:(libc)Descriptor Flags.
138
*/
139
static int set_cloexec_flag(int fd)
140
{
141
int ret = fcntl(fd, F_GETFD, 0);
142
/* If reading the flags failed, return error indication now. */
143
if(ret < 0){
144
return ret;
145
}
146
/* Store modified flag word in the descriptor. */
147
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
148
}
149
150
process *process_list = NULL;
151
152
/* Mark a process as completed when it exits, and save its exit
153
status. */
154
void handle_sigchld(__attribute__((unused)) int sig){
155
process *proc = process_list;
156
int status;
157
pid_t pid = wait(&status);
158
if(pid == -1){
159
perror("wait");
160
return;
161
}
162
while(proc != NULL and proc->pid != pid){
163
proc = proc->next;
164
}
165
if(proc == NULL){
166
/* Process not found in process list */
167
return;
168
}
169
proc->status = status;
170
proc->completed = true;
171
}
172
173
bool print_out_password(const char *buffer, size_t length){
174
ssize_t ret;
175
if(length>0 and buffer[length-1] == '\n'){
176
length--;
177
}
178
for(size_t written = 0; written < length; written += (size_t)ret){
179
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
180
length - written));
181
if(ret < 0){
182
return false;
183
}
184
}
185
return true;
186
}
109
#define BUFFER_SIZE 256
110
111
const char *argp_program_version =
112
"plugbasedclient 0.9";
113
const char *argp_program_bug_address =
114
"<mandos@fukt.bsnet.se>";
187
115
188
116
int main(int argc, char *argv[]){
189
const char *plugindir = "/lib/mandos/plugins.d";
117
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
190
118
size_t d_name_len;
191
DIR *dir = NULL;
119
DIR *dir;
192
120
struct dirent *dirst;
193
121
struct stat st;
194
122
fd_set rfds_all;
195
123
int ret, maxfd = 0;
196
uid_t uid = 65534;
197
gid_t gid = 65534;
124
process *process_list = NULL;
198
125
bool debug = false;
199
126
int exitstatus = EXIT_SUCCESS;
200
struct sigaction old_sigchld_action;
201
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
202
.sa_flags = SA_NOCLDSTOP };
203
char *plus_options = NULL;
204
char **plus_argv = NULL;
205
206
/* Establish a signal handler */
207
sigemptyset(&sigchld_action.sa_mask);
208
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
209
if(ret < 0){
210
perror("sigaddset");
211
exit(EXIT_FAILURE);
212
}
213
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
214
if(ret < 0){
215
perror("sigaction");
216
exit(EXIT_FAILURE);
217
}
218
127
219
128
/* The options we understand. */
220
129
struct argp_option options[] = {
230
139
{ .name = "plugin-dir", .key = 128,
231
140
.arg = "DIRECTORY",
232
141
.doc = "Specify a different plugin directory", .group = 2 },
233
{ .name = "userid", .key = 129,
234
.arg = "ID", .flags = 0,
235
.doc = "User ID the plugins will run as", .group = 2 },
236
{ .name = "groupid", .key = 130,
237
.arg = "ID", .flags = 0,
238
.doc = "Group ID the plugins will run as", .group = 2 },
239
{ .name = "debug", .key = 131,
142
{ .name = "debug", .key = 129,
240
143
.doc = "Debug mode", .group = 3 },
241
144
{ .name = NULL }
242
145
};
243
146
244
147
error_t parse_opt (int key, char *arg, struct argp_state *state) {
245
/* Get the INPUT argument from `argp_parse', which we know is a
246
pointer to our plugin list pointer. */
148
/* Get the INPUT argument from `argp_parse', which we
149
know is a pointer to our plugin list pointer. */
247
150
plugin **plugins = state->input;
248
151
switch (key) {
249
152
case 'g':
250
153
if (arg != NULL){
251
char *p;
252
while((p = strsep(&arg, ",")) != NULL){
253
if(strcmp(p, "") == 0){
254
continue;
255
}
154
char *p = strtok(arg, ",");
155
do{
256
156
addargument(getplugin(NULL, plugins), p);
257
}
157
p = strtok(NULL, ",");
158
} while (p);
258
159
}
259
160
break;
260
161
case 'o':
261
162
if (arg != NULL){
262
char *name = strsep(&arg, ":");
263
if(strcmp(name, "") == 0){
264
break;
265
}
266
char *opt = strsep(&arg, ":");
267
if(strcmp(opt, "") == 0){
268
break;
269
}
270
if(opt != NULL){
271
char *p;
272
while((p = strsep(&opt, ",")) != NULL){
273
if(strcmp(p, "") == 0){
274
continue;
275
}
163
char *name = strtok(arg, ":");
164
char *p = strtok(NULL, ":");
165
if(p){
166
p = strtok(p, ",");
167
do{
276
168
addargument(getplugin(name, plugins), p);
277
}
169
p = strtok(NULL, ",");
170
} while (p);
278
171
}
279
172
}
280
173
break;
287
180
plugindir = arg;
288
181
break;
289
182
case 129:
290
uid = (uid_t)strtol(arg, NULL, 10);
291
break;
292
case 130:
293
gid = (gid_t)strtol(arg, NULL, 10);
294
break;
295
case 131:
296
183
debug = true;
297
184
break;
298
185
case ARGP_KEY_ARG:
299
if(plus_options != NULL or arg == NULL or arg[0] != '+'){
300
argp_usage (state);
301
}
302
plus_options = arg;
186
argp_usage (state);
303
187
break;
304
188
case ARGP_KEY_END:
305
189
break;
312
196
plugin *plugin_list = NULL;
313
197
314
198
struct argp argp = { .options = options, .parser = parse_opt,
315
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
199
.args_doc = "",
316
200
.doc = "Mandos plugin runner -- Run plugins" };
317
201
318
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
319
if (ret == ARGP_ERR_UNKNOWN){
320
fprintf(stderr, "Unknown error while parsing arguments\n");
321
exitstatus = EXIT_FAILURE;
322
goto end;
323
}
324
325
if(plus_options){
326
/* This is a mangled argument in the form of
327
"+--option+--other-option=parameter+--yet-another-option", etc */
328
/* Make new argc and argv vars, and call argp_parse() again. */
329
plus_options++; /* skip the first '+' character */
330
const char delims[] = "+";
331
char *arg;
332
int new_argc = 1;
333
plus_argv = malloc(sizeof(char*) * 2);
334
if(plus_argv == NULL){
335
perror("malloc");
336
exitstatus = EXIT_FAILURE;
337
goto end;
338
}
339
plus_argv[0] = argv[0];
340
plus_argv[1] = NULL;
341
342
while((arg = strsep(&plus_options, delims)) != NULL){
343
new_argc++;
344
plus_argv = realloc(plus_argv, sizeof(char *)
345
* ((unsigned int) new_argc + 1));
346
if(plus_argv == NULL){
347
perror("realloc");
348
exitstatus = EXIT_FAILURE;
349
goto end;
350
}
351
plus_argv[new_argc-1] = arg;
352
plus_argv[new_argc] = NULL;
353
}
354
355
ret = argp_parse (&argp, new_argc, plus_argv, 0, 0, &plugin_list);
356
if (ret == ARGP_ERR_UNKNOWN){
357
fprintf(stderr, "Unknown error while parsing arguments\n");
358
exitstatus = EXIT_FAILURE;
359
goto end;
360
}
361
}
202
argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
362
203
363
204
if(debug){
364
205
for(plugin *p = plugin_list; p != NULL; p=p->next){
365
206
fprintf(stderr, "Plugin: %s has %d arguments\n",
366
p->name ? p->name : "Global", p->argc - 1);
207
p->name ? p->name : "Global", p->argc);
367
208
for(char **a = p->argv; *a != NULL; a++){
368
209
fprintf(stderr, "\tArg: %s\n", *a);
369
210
}
370
211
}
371
212
}
372
213
373
ret = setuid(uid);
374
if (ret == -1){
375
perror("setuid");
376
}
377
378
setgid(gid);
379
if (ret == -1){
380
perror("setgid");
381
}
382
383
214
dir = opendir(plugindir);
215
{
216
/* Set the FD_CLOEXEC flag on the directory */
217
int fd = dirfd(dir);
218
ret = fcntl (fd, F_GETFD, 0);
219
if(ret < 0){
220
perror("fcntl F_GETFD");
221
goto end;
222
}
223
ret = fcntl(fd, F_SETFD, FD_CLOEXEC | ret);
224
if(ret < 0){
225
perror("fcntl F_SETFD");
226
goto end;
227
}
228
}
229
384
230
if(dir == NULL){
385
perror("Could not open plugin dir");
386
exitstatus = EXIT_FAILURE;
387
goto end;
388
}
389
390
/* Set the FD_CLOEXEC flag on the directory, if possible */
391
{
392
int dir_fd = dirfd(dir);
393
if(dir_fd >= 0){
394
ret = set_cloexec_flag(dir_fd);
395
if(ret < 0){
396
perror("set_cloexec_flag");
397
exitstatus = EXIT_FAILURE;
398
goto end;
399
}
400
}
231
fprintf(stderr, "Can not open directory\n");
232
return EXIT_FAILURE;
401
233
}
402
234
403
235
FD_ZERO(&rfds_all);
407
239
408
240
// All directory entries have been processed
409
241
if(dirst == NULL){
410
if (errno == EBADF){
411
perror("readdir");
412
exitstatus = EXIT_FAILURE;
413
goto end;
414
}
415
242
break;
416
243
}
417
244
431
258
if((d_name_len >= pre_len)
432
259
and strncmp((dirst->d_name), *pre, pre_len) == 0){
433
260
if(debug){
434
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
261
fprintf(stderr, "Ignoring plugin dir entry name \"%s\""
435
262
" with bad prefix %s\n", dirst->d_name, *pre);
436
263
}
437
264
bad_name = true;
449
276
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
450
277
== 0)){
451
278
if(debug){
452
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
279
fprintf(stderr, "Ignoring plugin dir entry name \"%s\""
453
280
" with bad suffix %s\n", dirst->d_name, *suf);
454
281
}
455
282
bad_name = true;
465
292
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
466
293
if (filename == NULL){
467
294
perror("malloc");
468
continue;
469
}
470
strcpy(filename, plugindir); /* Spurious warning */
471
strcat(filename, "/"); /* Spurious warning */
472
strcat(filename, dirst->d_name); /* Spurious warning */
473
474
ret = stat(filename, &st);
475
if (ret == -1){
476
perror("stat");
477
free(filename);
478
continue;
479
}
480
295
exitstatus =EXIT_FAILURE;
296
goto end;
297
}
298
strcpy(filename, plugindir);
299
strcat(filename, "/");
300
strcat(filename, dirst->d_name);
301
302
stat(filename, &st);
303
481
304
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
482
305
if(debug){
483
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
306
fprintf(stderr, "Ignoring plugin dir entry name \"%s\""
484
307
" with bad type or mode\n", filename);
485
308
}
486
free(filename);
487
309
continue;
488
310
}
489
311
if(getplugin(dirst->d_name, &plugin_list)->disabled){
490
312
if(debug){
491
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
313
fprintf(stderr, "Ignoring disabled plugin \"%s\"",
492
314
dirst->d_name);
493
315
}
494
free(filename);
495
316
continue;
496
317
}
497
plugin *p = getplugin(dirst->d_name, &plugin_list);
498
{
499
/* Add global arguments to argument list for this plugin */
500
plugin *g = getplugin(NULL, &plugin_list);
501
for(char **a = g->argv + 1; *a != NULL; a++){
502
addargument(p, *a);
503
}
504
}
318
// Starting a new process to be watched
505
319
int pipefd[2];
506
320
ret = pipe(pipefd);
507
321
if (ret == -1){
508
perror("pipe");
509
exitstatus = EXIT_FAILURE;
510
goto end;
511
}
512
ret = set_cloexec_flag(pipefd[0]);
513
if(ret < 0){
514
perror("set_cloexec_flag");
515
exitstatus = EXIT_FAILURE;
516
goto end;
517
}
518
ret = set_cloexec_flag(pipefd[1]);
519
if(ret < 0){
520
perror("set_cloexec_flag");
521
exitstatus = EXIT_FAILURE;
522
goto end;
523
}
524
/* Block SIGCHLD until process is safely in process list */
525
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
526
if(ret < 0){
527
perror("sigprocmask");
528
exitstatus = EXIT_FAILURE;
529
goto end;
530
}
531
// Starting a new process to be watched
322
perror(argv[0]);
323
goto end;
324
}
532
325
pid_t pid = fork();
533
if(pid == -1){
534
perror("fork");
535
exitstatus = EXIT_FAILURE;
536
goto end;
537
}
538
326
if(pid == 0){
539
327
/* this is the child process */
540
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
541
if(ret < 0){
542
perror("sigaction");
543
_exit(EXIT_FAILURE);
544
}
545
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
546
if(ret < 0){
547
perror("sigprocmask");
548
_exit(EXIT_FAILURE);
549
}
550
551
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
552
if(ret == -1){
553
perror("dup2");
554
_exit(EXIT_FAILURE);
555
}
328
closedir(dir);
329
close(pipefd[0]); /* close unused read end of pipe */
330
dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
556
331
557
if(dirfd(dir) < 0){
558
/* If dir has no file descriptor, we could not set FD_CLOEXEC
559
above and must now close it manually here. */
560
closedir(dir);
332
plugin *p = getplugin(dirst->d_name, &plugin_list);
333
plugin *g = getplugin(NULL, &plugin_list);
334
for(char **a = g->argv + 1; *a != NULL; a++){
335
addargument(p, *a);
561
336
}
562
337
if(execv(filename, p->argv) < 0){
563
perror("execv");
338
perror(argv[0]);
339
close(pipefd[1]);
564
340
_exit(EXIT_FAILURE);
565
341
}
566
342
/* no return */
567
343
}
568
/* parent process */
569
free(filename);
570
344
close(pipefd[1]); /* close unused write end of pipe */
571
345
process *new_process = malloc(sizeof(process));
572
346
if (new_process == NULL){
573
347
perror("malloc");
574
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
575
if(ret < 0){
576
perror("sigprocmask");
577
}
578
exitstatus = EXIT_FAILURE;
579
goto end;
580
}
581
582
*new_process = (struct process){ .pid = pid,
583
.fd = pipefd[0],
584
.next = process_list };
585
// List handling
586
process_list = new_process;
587
/* Unblock SIGCHLD so signal handler can be run if this process
588
has already completed */
589
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
590
if(ret < 0){
591
perror("sigprocmask");
592
exitstatus = EXIT_FAILURE;
593
goto end;
594
}
595
348
exitstatus = EXIT_FAILURE;
349
goto end;
350
}
351
352
new_process->fd = pipefd[0];
353
new_process->buffer = malloc(BUFFER_SIZE);
354
if (new_process->buffer == NULL){
355
perror("malloc");
356
exitstatus = EXIT_FAILURE;
357
goto end;
358
}
359
new_process->buffer_size = BUFFER_SIZE;
360
new_process->buffer_length = 0;
596
361
FD_SET(new_process->fd, &rfds_all);
597
362
598
363
if (maxfd < new_process->fd){
599
364
maxfd = new_process->fd;
600
365
}
601
366
602
}
603
604
/* Free the plugin list */
605
for(plugin *next; plugin_list != NULL; plugin_list = next){
606
next = plugin_list->next;
607
free(plugin_list->argv);
608
free(plugin_list);
367
//List handling
368
new_process->next = process_list;
369
process_list = new_process;
609
370
}
610
371
611
372
closedir(dir);
612
dir = NULL;
613
614
if (process_list == NULL){
615
fprintf(stderr, "No plugin processes started. Incorrect plugin"
616
" directory?\n");
617
process_list = NULL;
618
}
619
while(process_list){
620
fd_set rfds = rfds_all;
621
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
622
if (select_ret == -1){
623
perror("select");
624
exitstatus = EXIT_FAILURE;
625
goto end;
626
}
627
/* OK, now either a process completed, or something can be read
628
from one of them */
629
for(process *proc = process_list; proc ; proc = proc->next){
630
/* Is this process completely done? */
631
if(proc->eof and proc->completed){
632
/* Only accept the plugin output if it exited cleanly */
633
if(not WIFEXITED(proc->status)
634
or WEXITSTATUS(proc->status) != 0){
635
/* Bad exit by plugin */
636
if(debug){
637
if(WIFEXITED(proc->status)){
638
fprintf(stderr, "Plugin %u exited with status %d\n",
639
(unsigned int) (proc->pid),
640
WEXITSTATUS(proc->status));
641
} else if(WIFSIGNALED(proc->status)) {
642
fprintf(stderr, "Plugin %u killed by signal %d\n",
643
(unsigned int) (proc->pid),
644
WTERMSIG(proc->status));
645
} else if(WCOREDUMP(proc->status)){
646
fprintf(stderr, "Plugin %d dumped core\n",
647
(unsigned int) (proc->pid));
648
}
649
}
650
/* Remove the plugin */
651
FD_CLR(proc->fd, &rfds_all);
652
/* Block signal while modifying process_list */
653
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
654
if(ret < 0){
655
perror("sigprocmask");
656
exitstatus = EXIT_FAILURE;
657
goto end;
658
}
659
/* Delete this process entry from the list */
660
if(process_list == proc){
661
/* First one - simple */
662
process_list = proc->next;
663
} else {
664
/* Second one or later */
665
for(process *p = process_list; p != NULL; p = p->next){
666
if(p->next == proc){
667
p->next = proc->next;
668
break;
373
374
if (process_list != NULL){
375
while(true){
376
fd_set rfds = rfds_all;
377
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
378
if (select_ret == -1){
379
perror(argv[0]);
380
goto end;
381
}else{
382
for(process *process_itr = process_list; process_itr != NULL;
383
process_itr = process_itr->next){
384
if(FD_ISSET(process_itr->fd, &rfds)){
385
if(process_itr->buffer_length + BUFFER_SIZE
386
> process_itr->buffer_size){
387
process_itr->buffer = realloc(process_itr->buffer,
388
process_itr->buffer_size
389
+ (size_t) BUFFER_SIZE);
390
if (process_itr->buffer == NULL){
391
perror(argv[0]);
392
goto end;
393
}
394
process_itr->buffer_size += BUFFER_SIZE;
395
}
396
ret = read(process_itr->fd, process_itr->buffer
397
+ process_itr->buffer_length, BUFFER_SIZE);
398
if(ret < 0){
399
/* Read error from this process; ignore it */
400
continue;
401
}
402
process_itr->buffer_length += (size_t) ret;
403
if(ret == 0){
404
/* got EOF */
405
/* wait for process exit */
406
int status;
407
waitpid(process_itr->pid, &status, 0);
408
if(WIFEXITED(status) and WEXITSTATUS(status) == 0){
409
for(size_t written = 0;
410
written < process_itr->buffer_length;){
411
ret = write(STDOUT_FILENO,
412
process_itr->buffer + written,
413
process_itr->buffer_length - written);
414
if(ret < 0){
415
perror(argv[0]);
416
goto end;
417
}
418
written += (size_t)ret;
419
}
420
goto end;
421
} else {
422
FD_CLR(process_itr->fd, &rfds_all);
669
423
}
670
424
}
671
425
}
672
/* We are done modifying process list, so unblock signal */
673
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
674
NULL);
675
if(ret < 0){
676
perror("sigprocmask");
677
}
678
free(proc->buffer);
679
free(proc);
680
/* We deleted this process from the list, so we can't go
681
proc->next. Therefore, start over from the beginning of
682
the process list */
683
break;
684
}
685
/* This process exited nicely, so print its buffer */
686
687
bool bret = print_out_password(proc->buffer, proc->buffer_length);
688
if(not bret){
689
perror("print_out_password");
690
exitstatus = EXIT_FAILURE;
691
}
692
goto end;
693
}
694
/* This process has not completed. Does it have any output? */
695
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
696
/* This process had nothing to say at this time */
697
continue;
698
}
699
/* Before reading, make the process' data buffer large enough */
700
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
701
proc->buffer = realloc(proc->buffer, proc->buffer_size
702
+ (size_t) BUFFER_SIZE);
703
if (proc->buffer == NULL){
704
perror("malloc");
705
exitstatus = EXIT_FAILURE;
706
goto end;
707
}
708
proc->buffer_size += BUFFER_SIZE;
709
}
710
/* Read from the process */
711
ret = read(proc->fd, proc->buffer + proc->buffer_length,
712
BUFFER_SIZE);
713
if(ret < 0){
714
/* Read error from this process; ignore the error */
715
continue;
716
}
717
if(ret == 0){
718
/* got EOF */
719
proc->eof = true;
720
} else {
721
proc->buffer_length += (size_t) ret;
426
}
722
427
}
723
428
}
724
429
}
725
726
430
727
431
end:
728
729
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
730
/* Fallback if all plugins failed, none are found or an error occured */
731
bool bret;
732
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
733
char *passwordbuffer = getpass("Password: ");
734
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
735
if(not bret){
736
perror("print_out_password");
737
exitstatus = EXIT_FAILURE;
738
goto end;
739
}
740
}
741
742
/* Restore old signal handler */
743
sigaction(SIGCHLD, &old_sigchld_action, NULL);
744
745
free(plus_argv);
746
747
/* Free the plugin list */
748
for(plugin *next; plugin_list != NULL; plugin_list = next){
749
next = plugin_list->next;
750
free(plugin_list->argv);
751
free(plugin_list);
752
}
753
754
if(dir != NULL){
755
closedir(dir);
756
}
757
758
/* Free the process list and kill the processes */
759
for(process *next; process_list != NULL; process_list = next){
760
next = process_list->next;
761
close(process_list->fd);
762
ret = kill(process_list->pid, SIGTERM);
763
if(ret == -1 and errno != ESRCH){
764
/* set-uid proccesses migth not get closed */
765
perror("kill");
766
}
767
free(process_list->buffer);
768
free(process_list);
769
}
770
771
/* Wait for any remaining child processes to terminate */
772
do{
773
ret = wait(NULL);
774
} while(ret >= 0);
775
if(errno != ECHILD){
776
perror("wait");
777
}
778
432
for(process *process_itr = process_list; process_itr != NULL;
433
process_itr = process_itr->next){
434
close(process_itr->fd);
435
kill(process_itr->pid, SIGTERM);
436
free(process_itr->buffer);
437
}
438
439
while(true){
440
int status;
441
ret = wait(&status);
442
if (ret == -1){
443
if(errno != ECHILD){
444
perror("wait");
445
}
446
break;
447
}
448
}
779
449
return exitstatus;
780
450
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0